

A048547


a(n) is the smallest value of m such that A002378(m), the mth oblong number, contains exactly n 9's.


10



9, 31, 890, 2234, 14131, 30331, 173031, 969520, 9958890, 31617890, 360542549, 547631234, 3316547890, 17318486343, 114017542334, 356363452109, 3065925634968
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..17.
Eric Weisstein's World of Mathematics, Pronic Number


EXAMPLE

From Jesse Sealand, Oct 07 2019: (Start)
a(1) = 9 since A002378(9) = 90;
a(2) = 31 since A002378(31) = 992;
a(3) = 890 since A002378(890) = 792990;
a(4) = 2234 since A002378(2234) = 4992990, etc.
(End).


CROSSREFS

Cf. A048548, A002378.
Cf. A048529, A048531, A048533, A048535, A048537, A048539, A048541, A048543, A048545.
Sequence in context: A177743 A266710 A159279 * A141573 A075433 A018833
Adjacent sequences: A048544 A048545 A048546 * A048548 A048549 A048550


KEYWORD

nonn,base,more


AUTHOR

Patrick De Geest, May 15 1999


EXTENSIONS

a(13)a(16) from Lars Blomberg, Jun 10 2011
Name edited by Jesse Sealand, Oct 07 2019
a(17) from Giovanni Resta, Oct 09 2019


STATUS

approved



